interrelationship

US /ˌɪn.t̬ɚ.rɪˈleɪ.ʃən.ʃɪp/
UK /ˌɪn.t̬ɚ.rɪˈleɪ.ʃən.ʃɪp/
1.

mối quan hệ qua lại

the way in which two or more things or people are connected and affect one another:

:
the interrelationship between smoking and respiratory disease